MXPA00011093A

MXPA00011093A - Cold steel cambering apparatus and method.

Info

Publication number: MXPA00011093A
Application number: MXPA00011093A
Authority: MX
Inventors: William B Leftwich
Original assignee: Banks Corp
Priority date: 1999-11-12
Filing date: 2000-11-10
Publication date: 2003-04-25
Also published as: US6474124B1; CA2325813A1; CA2325813C

Abstract

A cold steel cambering apparatus and method of use, the apparatus comprising, a cambering assembly having a forward- most end and a rearward-most end and therebetween a plurality of adjustable beam guides, each having means to restrain lateral movement of at least one cold steel beam placed on the cambering assembly, with a plurality of guides also having second means to restrain upward movement of at least one cold steel beam placed on the cambering assembly; and at least one hydraulic lift cylinder positioned directly under at least one cold steel beam placed on the cambering assembly with means to impart a concave or upward camber to at least one cold steel beam placed on the cambering assembly over the forward hydraulic cylinder and restrained by the means to restrain lateral and upward movement.

Description

METHOD AND APPARATUS FOR CURVING STEEL IN FRIÓ FIELD OF THE INVENTION The present invention relates, in general to the field of devices and methods for applying a curvature to steel beams, and more particularly to an apparatus and method for applying a cold bending to steel beams such as those used in manufacturing. of steel structures for trailers.

BACKGROUND OF THE INVENTION In the construction of steel structures for large trailers of all types, it is well known that it is very advantageous to apply a curvature to the main steel beams of the trailers, be they pipes, I-beams or C-channel. of the trailers with appropriate curvatures in their main beams are under load, the main steel beams bend until they are substantially straight, but do not warp, as would have been the case if REF .: 125053 Main steel beams lacked a curvature before being placed under load. Up to now curves have been imparted to the main steel beams of the trailers, applying heat to the upper or lower part of the steel beams, when a pronounced bending force is applied to the opposite sides of the beams. The result has been the curvatures in the steel beam, with relatively sharp twists where the bending forces have been applied during the process of warping with heat.

BRIEF DESCRIPTION OF THE INVENTION The present invention provides a novel apparatus and method for cold bending, to impart bends to the steel beams used in the manufacture of structures for trailers, which eliminates the sharp twists imparted to the steel beams during the process of warping with heat , of the previous technique. The present invention can be used to impart cold bending to steel, I and C-channel beams, as well as to tubes, either individually or after they have been incorporated into the trailer structure. It has also been found that cold bending imparts a curvature that holds better than a comparable heat-induced curvature. In addition, the cold bend imparted to the steel beams is in the form of a preferred large radius arc, which is opposite to the acute twist curls typically found in heat induced corrugations of the prior art. . A preferred embodiment of the present invention is an apparatus for cold-bending steel, which comprises a movable forward stowage assembly, having an end located at the most forward position and an end located at the rearmost position and between them a plurality of guides for beams, adjustable, each of which has first means to restrict the lateral movement of at least one cold steel beam placed on the front assembly for bending, where a plurality of guides at the ends, also have second means to restrict the upward movement of to minus a cold steel beam placed on the front mount for bent; and at least one front hydraulic lift cylinder, positioned centrally between the ends and directly below the at least one cold steel beam positioned on the front mount for bending with third means for imparting a concave curvature to at least one steel beam cold placed on the front mount for bent over the front hydraulic cylinder which is restricted by the first and second means; a mobile, rear, bent assembly, aligned with the front bent assembly and having one end located at the front most and one end located at the rearmost part, and between them a plurality of adjustable guides for beams, each one of which has fourth means for restricting lateral movement and fifth means for restricting the upward movement of at least one cold steel beam placed simultaneously on the rear mount for bending and the front mount for bending, and at least one pair of lifting cylinders hydraulics positioned so that they are at the rearmost end portion of the rear mount for bending and directly below at least one cold steel beam placed on the rear bent assembly, with sixth means for imparting an upward curvature, to at least one cold steel beam placed on the rear mounting for bending, on the rear hydraulic cylinders, and restricted by the fourth and fifth means. Another preferred embodiment of the present invention is an apparatus for bending cold steel, comprising a bending assembly having an end located at the forward part and an end located at the rearmost part and between them a plurality of guides for beams, adjustable, each of which has first means for restraining the lateral movement of at least one cold steel beam placed on the bent assembly, with a plurality of guides at the ends and also has second means to restrict movement towards above, of at least one cold steel beam placed on the assembly for bent; and at least one hydraulic lift cylinder positioned centrally between the ends and directly below the at least one cold steel beam positioned on the bent assembly, with means for imparting a concave curvature to at least one cold steel beam placed on the assembly for bent over the front hydraulic cylinder and restricted by the first and second means. Another preferred embodiment of the present invention is an apparatus for bending cold steel, which comprises a bent assembly, having an end located at a more forward position and an end located at a rearmost position and between them a plurality of adjustable beam guides, each of which have first means for restraining lateral movement and second means for restraining the upward movement, of at least one cold steel beam placed on the bent assembly, and at least one pair of hydraulic lift cylinders, rear, placed to be in the end portion more front of the rear mount for bending and directly below the at least one cold steel beam placed on the rear bending mount, with means for imparting an upward curvature, to at least one cold steel beam placed on the bending mount, above the rear hydraulic lifting cylinders and restricted by the first and second means. Another preferred embodiment of the present invention is a method for providing a bend to a cold steel beam, which comprises providing a forward, movable stoop assembly having a forwardmost end and a rearmost end and between them a plurality of adjustable beam guides, each of which has first means for restraining the lateral movement of at least one cold steel beam positioned on the front stowage mounting, wherein a plurality of guides are found on the ends, also has second means for restricting the upward movement, of at least one cold steel beam placed on the front assembly for curved; and at least one front hydraulic lift cylinder, positioned centrally between the ends and directly below the at least one cold steel beam placed on the front stowage, with third means for imparting a concave curvature to at least one steel beam cold placed on the front assembly for bent over the front hydraulic cylinder and restricted by the first and second means; and a rear movable stowage assembly, aligned with the front stowage assembly and having one end located in a forward position and one end located in a rearmost position and between them a plurality of adjustable, adjustable beam guides. of which has fourth means for restraining lateral movement and fifth means for restraining the upward movement, of at least one cold steel beam placed simultaneously on the rear mount for bending and the front mount for bending, and at least one pair of rear hydraulic cylinders, placed so that they are in the rearmost end portion, of the rear mounting for curved and directly below the at least one cold steel beam placed on the rear mount for bending, with sixth means for imparting an upward curvature, to at least one cold steel beam placed on the rear mount for bending, on top of cylinders hydraulic, rear elevators, and restricted by the fourth and fifth means; and at least one cold steel beam to be bent; adjusting the spacing between the rear and front assemblies, for bending, in direct relation to the length of at least one cold steel beam of the supply stage; first placing at least one cold steel beam of the supply stage, on the front mounting for bending where the desired center of a concave front curvature to be imparted to at least one cold steel beam, of the supply stage , on at least one of the front hydraulic lifting cylinders; second, place at least one cold steel beam, from the supply stage, on the rear mount for bending, with the end of each beam on at least one of the lifting cylinders hydraulic backs; Capture at least one cold steel beam, from the supply stage, with the guides for beams, adjustable, front and rear; first lifting at least one of the front hydraulic lifting cylinders to bend at least one cold steel beam, from the supply stage, to a point greater than a desired curvature in the beam and supporting the forward hydraulic lift cylinder at that point; second, lifting at least one of the rear hydraulic lift cylinders, to bend at least one cold steel beam, from the supply stage, to a point greater than a desired curvature in the beam and maintaining the rear hydraulic lift cylinder in that point; and lowering hydraulic cylinders, front and rear, and verify the dimensions of the final desired curvature in the beam. Objects and related advantages of the present invention will be apparent from the following descriptions.

BRIEF DESCRIPTION OF THE FIGURES OF THE DRAWING Figure 1 is a perspective view of the front bent assembly, of the preferred embodiment of the present invention. Figure 2 is a perspective view of the rear bent assembly of the preferred embodiment of the present invention. Figure 3 is a view of the right side of the front bent assembly of Figure 1. Figure 4 is a view of the right side of the rear bent assembly of Figure 2. Figure 5 is a front end view, in section, of the front bent assembly, of figure 1, taken along line 5-5, illustrating a single beam mounted for bending. Figure 6 is a front end view of the rear bending assembly, of Figure 2, illustrating a single beam mounted for bending.

Figure 7 is a representation of the general shape of the desired curvature in beams used in the manufacture of large trailers.

DETAILED DESCRIPTION OF THE MODALITIES PREFERRED Referring now to the drawings, the cold steel bending apparatus 10 of the present invention comprises independent, front and rear 14 and stowage assemblies, both of which can be moved on the wheels 16, 18 respectively. to allow them to be separated in an adjustable manner and accommodate beams and structures of varying lengths. The wheels 16, 18 are mounted to lower, longitudinal support beams, 20, 22 and 24, 26 of the front and rear mountings 14, for bending, respectively, supporting support beams, lower, transverse beams, 28, 30, respectively. The supporting, transverse, lower beams 28, 30 directly support the transverse support beams, upper, 32, 34 of the front mounting for bent 12 and support beams, transverse, upper, 36, 38 of the rear mounting for bending 14. The upper, transverse support beams 32, 36 of the front and rear mountings 14, for bending, respectively, are fixed to the supporting, transverse, lower beams, 28, 30, respectively. The upper, transverse, supporting beams 34, 38 are slidably joined to the lower, transverse, supporting beams 28, 30, respectively, with conventional means such that the upper, transverse, supporting beams 34 and 38 they slide above and parallel to the lower support beams, 28, 30, respectively. In the preferred embodiment, to date, the support beams, lower, and the support beams, transverse, lower, have been steel beams in I. Mounted to the support beams, transverse, upper, 32, 34, 36, 38 are the support beams, upper, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62 all of which have been C-channel steel beams, in the preferred mode to date. The upper support beams are aligned in parallel relation with each other and with the lower, longitudinal support beams 20, 22, 24, 26. The upper support beams 40, 42, 44 and 52, 54, 56 are fixed to the transverse, upper, fixed support beams, 32, 36 of the front 12 and rear 14 assemblies, for bending. The upper support beams 40, 42 and 52, 54, which are C-channel steel beams, in the preferred embodiment to date, are mounted to the upper, transverse, supporting beams 32, 36, respectively, with their flanges facing outwards, thereby forming parallel open channels 64, 66, respectively, between them, along all their lengths. The upper support beams 46, 48, 50 and 58, 60, 62 are fixed to the supporting, transverse, upper, mobile »beams, 34, 38 of the front and rear mountings 12 for bending, respectively.

The support beams, upper, 46, 48 and 58, 60, which are also C-channel beams in the preferred embodiment to date, are mounted to the upper, transverse, supporting beams 34, 38, respectively, with their flanges facing outwards, whereby they form parallel open channels 68, 70, respectively, between them, along their entire length. Extending in the open channels 64, 68 and 66, 70, at right angles, there is a plurality of slide rails 72 which are secured to the upper support beams 40, 42, 44, 46, 48, 50; 52, 54, 56, 58, 60, 62. The slide rails 72 slidably support the beam guides 74. The beam guides 74 are slidably mounted in pairs, with the exception of the split individual guide 75 mounted on the forwardmost end of the front mount 12 for bending, to the slide rails 72 to provide lateral support to the beams subjected to load for the bent and prevent beams from bending laterally during the bending process. One of each pair of guides 74 and 75 for beams, on the front mount 12 for bending, from the preferred embodiment to the The date is fixed in its position on the edge of the open channels 64, 68 to provide a fixed lateral guide and support for a beam to be bent. All of these fixed guides 76, 77, for beams, are on the same side of each of the open channels 64, 68. Opposite each fixed guide 76, 77, for beam, of the front assembly 12 for bending, with the exception of the guide 75 on the front assembly 12 for bending, there is a guide 78 for beams, which can be adjusted by sliding, the position of which along its sliding rail 72 is controlled by the hydraulic pistons of the lower part , front, 80. Hydraulic lower pistons, front 80, allow adjustable beams guides 78 to be selectively placed against variable width beams that are placed between pairs of guides 74, 75 for beams. On the rear mount 14 for bending, one of each pair of beam guides 74, located above the open channel 66 is fixed in its position on the edge of the open channel 66 to provide a guide fixed lateral and support for a beam that is going to bend. All of these fixed guides 82 for beams are on the same side of the open channel 66. Opposite each fixed guide 82 for beams, there is a guide 84 for beams, slidably adjustable, the position of which along its rail. Sliding 72 is controlled by the hydraulic piston of the lower, rear part, 86. The hydraulic pistons of the lower part, rear, 86, allow adjustable guides 84 for beams, to be selectively placed against beams of varying widths that are placed between the pairs of guides 74 for beams, above the open channel 66 for bending. Both of each pair of beam guides 74, located above the open channel 70, on the rear mount 14 for bending, can be slidably fitted along their slide rails 72 with the positions of each, controlled by the pistons hydraulic, rear, 88. The ability to adjust both pairs of guides 74 for beams, allows the rear assembly 14 for bending, the present invention, fits a wide variety of later portions of the beams to be bent. It is on the back of the trailers, for example, where two beams can be overlapped to provide additional resistance to the axle and wheel assemblies. In the preferred embodiment to date, the forward bent assembly 12 has been provided with eleven pairs of guides 74 for beams, five above the open channel 64, five above the open channel 68 and a pair 75 on the beams 40. , 48 that extend at the forwardmost end. The fixed, individual rafter guide 77 is provided at the forwardmost end of the front mount 12 for bending, in order to allow opening of the front part of the assembly 12 by reducing the upper support beams 42, 44, 46. The removal of a portion of the beams 42, 44, 46 provides free space for the hanging hitch of the structure of a trailer. This allows the centerline of the front camera to be closer to the hitch, approximately 1.52 meters (five feet), which is important for smaller trailer structures. Adjusted in the central part of each open channel 64, 68 of the front mount 12 for bending, approximately at the center point thereof, is a front hydraulic lift cylinder, 90, for forcing the steel beams upwards and imparting the beams a concave curvature. To constrain the beams at the ends of the desired concave curvature, the four slide guides 78, slidably adjustable, at each end of the forward assembly 12 for bending, as well as the guide 77 for fixed beams, are further provided with hydraulic pistons. , front, of the upper part, 92, which are attached to the bolts 94 of the front hydraulic piston. The bolts 94 extend through the clearance between the upper portions of these pairs of beam guides 74, when the guides 78, slidably adjustable, are placed against the joists by the hydraulic pistons of the lower part, front, 80, such as that the pins 94 are partially received within each of the steel beams above, which are in between. The exception is the fixed guide 77 for beams, the pin 94 of which can be extended but not received within a corresponding guide for beams. The bolts 94 will then restrict the beams against upward movement, in all these places, when the hydraulic front lifting cylinders, 90, move upwards and against the beams mounted in the forward assembly 12 for bending, in order to impart a concave curvature to the beams. In the preferred embodiment to date, the rear mount 14 for bending has been provided with twenty-two pairs of guides 74 for beams, eleven of which are above the open channels 66, 70. Accommodated in the most posterior portions of each channel open 66, 68 of the rear mount 14 for bending, there is a pair of rear hydraulic cylinders, 96, 97, each of which can be programmed separately, to force the steel beams upwards and impart a curvature upwards to the most posterior portions of the beams. For restrict to the beams forward of the upward curvature, desired, imparted by the lifting cylinders 96, 97, the guides 84, for beams, slidably adjustable, along the open channel 66 are further provided with hydraulic rear pistons, of the upper part, 98, which are attached to the bolts 100 of the rear hydraulic piston. Similarly, one of each pair of slide guides 74, slidably adjustable, along the same side of the open channel 70 is further provided with a rear hydraulic piston, of the upper part, 98, which is attached to a bolt 100. of the rear hydraulic piston. The bolts 100 extend through the clearance between the upper portions of each pair of adjustable beam guides 74, when the pairs of beam guides 74 are all placed against a beam, such that the bolts 100 are partially received inside each of the beams above, which are in between. Bolts 100 will restrain a beam from upward movement, when the hydraulic, rear, 96 riser cylinders move toward up and against a beam. As illustrated in Figure 2, the heights of the pairs of beam guides 74, in the rear mount 14 for bending, progressively increase in height from the front to the rear of the rear mount 14 for bending. In this way, the relative heights of the bolts 100 progressively increase from the front to the rear of the rear mount 14 for bending. This allows a beam to be arched upward, from the front to the rear of the rear mount 14 for bending, when the lifting cylinders 96 and 97 are lifted upwards. The conventional hydraulic, associated and associated control lines, hoses and lines for all the lifting pistons and cylinders are not illustrated in any of the figures in the drawing to eliminate unnecessary confusion. All the feeding tubes, hoses and control lines are located in the front and rear stowing assemblies 14, and are channeled through telescopic tunnels to allow length change. The power supply hydraulic 77 is illustrated in Figures 1 and 3. In the preferred embodiment to date, the operation of all hydraulic lift cylinders 90, 96, 97 and pistons 80, 92, 86, 88, 98 is controlled by physical elements of computation and CNC technology, conventional, which are well known and understood by those skilled in the art. The computer / control panel 79 which controls the operation of all the hydraulic lifting cylinders and pistons, of the preferred embodiment to date, is illustrated in Figures 1 and 3. In an operative alignment, the bent apparatus 10, of the preferred embodiment to date, has the front mount 12 for bent, aligned with the rear mount 14 for bent, such that the open channel 64 of the forward bent assembly 12 is aligned with the open channel 66 of the rear mount 14 for curved. The spacing between the front 12 and rear 14 assemblies, for bending depends on the length of the beams that are going to be bent cold. If you are going to bend one beam, this will be placed on the open channels 64, 66 and the beam will be positioned such that the desired center of the front concave curvature will be placed on top of the front hydraulic lift cylinder, 90, within the open channel 64. The rear apparatus 14 for bending will be positioned relative to the front bent apparatus 12, such that the end of the beam to be bent is on the rear hydraulic lift cylinder 97 within the open channel 66. The guides 78, 84 for beams, slidably adjustable, they are then placed to tightly capture the beam between them and their corresponding, fixed, fixed beams 76, 82, through the actions of the pistons 80, 92, 86, 88, 98, each of which it is provided with a cylinder 81 brand PANCAKE with stroke of 0.8 centimeters (5/16 inches), which is a pneumatic cylinder with large inside diameter and short stroke. The PANCAKE brand cylinders 81 eliminate the need to verify the dimensional differences between single-beam structures and double-beam structures. The cylinders 81 brand PANCAKE they allow each of the adjustable guides 78, 84, for beams, to apply an appropriate pressure-free capture space, regardless of the dimensional variations of the beams. Subsequently, the bolts 94, 100 of the piston extend above the beam. Subsequently, the front hydraulic lifting cylinders 90 in the open channel 64 are raised to a selected dimension and are thus maintained. The selected dimension will be slightly larger than the desired final curvature dimension. Then the rear hydraulic lift cylinder 96 in the open channel 66 will rise again to a dimension slightly larger than the desired final bend dimension and will be maintained for five seconds. The hydraulic lifting cylinders, front and rear, are lowered both later and the beam is inspected with respect to the desired curvature dimensions. If the desired dimensions have not been obtained, the hydraulic lifting cylinders 90 are raised again in the same sequence, followed by additional dimensional checks. It is known that steel should be bent a little more of the count, when bending cold, to obtain the dimension of permanent, desired cold bending, when the desired permanent dimensions have been obtained, all the hydraulic elevators and pistons are retracted and the beam is removed. The curving apparatus of the present invention provides flexibility in the handling of individual beams of 20.32, 25.40, or 30.48 centimeters (8, 10 or 12 inches). It also allows pre-welded trailer structures having two main beams of 8, 10 or 12 inches and multiple smaller transverse beams to be mounted directly on the bent apparatus 10 and a cold bend be applied to both main beams simultaneously. The relative positions of the open channels 68, 70 and of the open channels 64, 66, can be changed to accommodate structures of varying widths, using hydraulic pistons 110 of the front structure, which are attached to the upper support beam 46, and hydraulic pistons 120 of the rear structure, which are attached to the upper support beam 58. The sequence of the cold bending stages, for a finished structure, is the same as the one mentioned above for an individual beam. Although the preferred embodiment of the invention has been illustrated and described with details in the preceding drawings and description, it should be considered as illustrative and not of a restrictive nature, it being understood that only the preferred embodiment has been presented and described, and that it is desired to protect all changes and modifications that are within the spirit of the invention. It is noted that in relation to this date, the best method known to the applicant to carry out the aforementioned invention. is that which is clear from the present description of the invention. Having described the invention as above, the content of the following is claimed as property:

Claims

RE IVINDICATIONS

1. An apparatus for bending steel in cold, characterized in that it comprises: a movable assembly for bending, front, having one end located in the most forward position and one end located in the most rear position, and between them a plurality of guides for beams , adjustable, each of which has a first means for restraining the lateral movement of at least one cold steel beam placed on the front stowing assembly, with a plurality of guides at the ends which also have second means for restraining movement upwards, of at least one cold steel beam placed on the front mount for bent; and at least one front hydraulic lift cylinder located centrally between the ends and directly below a cold steel beam positioned on the front stowage assembly, with third means for imparting a concave curvature to at least one cold steel beam placed on the front assembly for bent, above front hydraulic cylinder and restricted by the first and second means; a rear, movable, bent assembly, aligned with the front bent assembly and having one end located in the most forward position and one end in the rearmost position, and between them a plurality of adjustable, adjustable beam guides, each one of which has fourth means for restricting lateral movement and one fifth means for restricting the upward movement of at least one cold steel beam placed simultaneously on the rear mount for bending and the front mount for bent, and at least one pair of rear hydraulic lift cylinders, located so that they are in the end portion located in the rearmost position of the rear mount for bending and directly below a cold steel beam placed on the rear mount for bent, with sixth means to impart an upward curvature, to at least one cold steel beam placed on the rear mounting for bent, on top of the lifting cylinders hydraulic, and restricted by the fourth and fifth means.

2. The assembly for bending cold steel, according to claim 1, characterized in that the first and the second, and the fourth and fifth means, restrict the lateral and upward movements of two cold steel beams, placed on the mounts front and rear for bent.

3. The apparatus for bending steel in cold, according to claim 2, characterized in that a hydraulic front lifting cylinder, and at least one rear hydraulic lifting cylinder, are located below each cold steel beam.

4. The apparatus for bending steel in cold, according to claim 3, characterized in that the two cold steel beams are the two main beams of a trailer structure, pre-welded.

The device for bending steel in cold, characterized in that it comprises: a bent assembly, having one end located in the most forward position and one end located in the rearmost position, and between them a plurality of adjustable, adjustable beam guides, each of which has first means for restricting the lateral movement of at least one cold steel beam placed on the bending assembly, wherein a plurality of guides at the ends, also have second means for restricting the upward movement of at least one steel beam cold placed on the assembly for bent; and at least one hydraulic lift cylinder positioned centrally between the ends and directly below the at least one cold steel beam positioned on the bent assembly, with means for imparting a concave curvature to at least one cold steel beam placed on the front assembly for bent, on the hydraulic cylinder and restricted by the first and second means.

6. The apparatus for bending steel in cold, according to claim 5, characterized in that the first and second means restrict the lateral and upward movements of two cold steel beams placed on the bent assembly.

7. The apparatus for bending steel in cold, according to claim 6, characterized in that a hydraulic lifting cylinder is placed directly below each cold steel beam.

8. The apparatus for bending steel in cold, according to claim 7, characterized in that the two cold steel beams are the two main beams of a trailer structure, pre-welded.

9. An apparatus for bending cold steel, characterized in that it comprises: a bent assembly, having one end located in the most forward position and one end located in the rearmost position, and between them a plurality of adjustable, adjustable beam guides; each of which have first means to restrict the lateral movement and second means for restraining the upward movement of at least one cold steel beam, placed on the bending assembly, and at least one pair of rear hydraulic lifting cylinders, positioned to be at the end portion located at the rearmost position, of the rear mounting for bent, and directly below a cold steel beam placed on the rear bent assembly, with means for imparting an upward curvature, to at least one cold steel beam placed on the assembly for bending over the rear hydraulic lift cylinders and restricted by the first and second means.

10. The apparatus for bending steel in cold, according to claim 9, characterized in that the first and second means restrict the lateral and upward movements of two cold steel beams, placed on the bending apparatus.

11. The apparatus for bending steel in cold, according to claim 10, characterized in that at least one hydraulic lifting cylinder is located directly below each cold steel beam.

12. The apparatus for bending cold steel, according to claim 11, characterized in that the two cold steel beams are the two main beams of a trailer structure, pre-welded.

13. A method for providing a bend to a cold steel beam, characterized in that it comprises: providing a forward, movable, stooped assembly, having one end located in a more forward position and an end located in a more posterior position, and between there are a plurality of adjustable beam guides, each of which has first means for restraining the lateral movement of at least one cold steel beam placed on the front stowing assembly, wherein a plurality of guides on the ends also have second means for restricting the upward movement of at least one cold steel beam placed on the front mount for bent; and at least one front hydraulic lift cylinder, located centrally between the ends and directly below the at least one cold steel beam positioned on the front stowage, with third means for imparting a concave curvature to at least one steel beam cold placed on the front mount for bent, on top of the front hydraulic cylinder, and restricted by the first and second means; and a movable rear stowage assembly, aligned with the forward stowage assembly, and having one end located at a forward position and one end located at a rearmost position and between them a plurality of adjustable beam guides, each one of which has a fourth means for restricting lateral movement and a fifth means for restricting the upward movement of at least one cold steel beam placed simultaneously on the rear mount for bending and the front mount for bending, and at least a pair of rear hydraulic cylinders, positioned so that they are in the end portion located in the rearmost position, of the rear mount for bent, and directly below the at least one cold steel beam placed on the rear mount for bent, with a sixth means for imparting an upward curvature, to at least one cold steel beam placed on the rear mount for bending, on top of the rear hydraulic lift cylinders and restricted by the fourth and fifth means; and at least one cold steel beam to be bent; adjust the spacing between the rear and forward bent pair mounts, in direct relation to the length of at least one cold steel beam of the supply stage; first place at least one cold steel beam, from the supply stage, on the front mount for bending, with the desired center of a concave front curvature to be imparted to at least one cold steel beam, from the stage of supply, on top of minus one of the front hydraulic lifting cylinders; secondly placing at least one cold steel beam, from the supply stage, on top of the rear mount for bending, with the end of each beam on at least one of the rear, hydraulic lift cylinders; capture at least one cold steel beam, from the supply stage, with the guides for adjustable beams, front and rear; first lifting at least one of the forward hydraulic lifting cylinders, to bend at least one cold steel beam, from the supply stage, to a point greater than a desired curvature in the beam and maintaining the forward hydraulic lift cylinder at that point; secondly raising at least one of the rear hydraulic lift cylinders, to bend at least one cold steel beam, from the supply stage, to a point greater than a desired curvature in the beam, and keeping the subsequent hydraulic cylinder in that point; Y lower hydraulic cylinders, front and rear, and verify the dimensions of the final, desired curvature in the beam.

14. The method for providing a bend to a cold steel beam, according to claim 13, characterized in that the first and the second, and the fourth and fifth means, of the supply stage, restrict the lateral and upward movements of two cold steel beams, placed on the front and rear mounts, for bending.

15. The method of providing a bend to a cold steel beam, according to claim 14, characterized in that a forward hydraulic lift cylinder, and at least one rear hydraulic lift cylinder, of the supply stage, are placed directly below of each cold steel beam. 16 The method to provide a curvature to a cold steel beam, according to claim 15, characterized in that the two cold steel beams are the main beams of a trailer structure, pre-welded.